While searching for my quest of getting most of my investment on an iPhone, I came across following E-books that I found really helpfull. I hope you will like these too.

Get up to speed fast with this full-color guide to Apple’s revolutionary new mobile phone– widescreen video iPod–Internet communications device.
Announced to great fanfare, Apple’s iPhone promises to reinvent the market for portable electronic devices, combining mobile phone, music and video player, digital camera, Internet browser, and e-mail in a single sleekly designed, brilliantly engineered package. Illustrated throughout with full-color screen shots and illustrations, this fun and easy guide helps you make the most of all the features of this pioneering device.

As you’d expect of Apple, the iPhone is gorgeous. iPhone: The Missing Manual is a book as breathtaking as its subject. Teeming with high-quality color graphics, each custom designed page helps you accomplish specific tasks — everything from Web browsing to watching videos. Written by New York Times columnist and Missing Manual series creator David Pogue, this book shows you how to get the most out of your new Apple iPhone.
Written by New York Times columnist and Missing Manual series creator David Pogue, iPhone: The Missing Manual shows you everything they need to know to get the most out of your new Apple iPhone. Full of humor, tips, tricks, and surprises, this book teaches you how to extend iPhone’s usefulness by exploiting its links to the Web as well as its connection to Macs or PCs; how to save money using Internet-based messages instead of phone calls; and how to fill the iPhone with TV shows and DVDs for free.

Unleash your iPhone and take it to the limit using secret tips and techniques from gadget hacker Erica Sadun. Fast and fun to read, Taking Your iPhone to the Max will show you how get the most out of Apple’s iPhone. You’ll find all the best, and undocumented, tricks as well as the most efficient and enjoyable introduction to the iPhone you’ll ever find.
Starting with a guide to iPhone basics, you’ll quickly move on to discover the iPhone’s hidden potential, like how to connect to a TV, get contract-free VOIP, and hack OS X so it will run apps on your iPhone. From e-mail and surfing the Web, to using iTunes, iBooks, games, photos, ripping DVDs and getting free VOIP with Skype or Jajah, you’ll find it here. You’ll even find tips on where to get the best and cheapest iPhone accessories. Get ready to take iPhone to the max!
What you’ll learn
* iPhone basics
* E-mail, voicemail, and using iCal
* Surfing the Web with iPhone using Safari
* Expanding the main menu using third-party software
* Using iTunes, games, and iBooks
* Connecting to the TV and ripping DVDs
* Hacking OS X to run apps on the iPhone
* Getting contract-free VOIP
* Saving on accessories and what you really need

This hands-on, in-depth book introduces developers to the initial release of the iPhone application platform and assists them in creating Web 2.0 applications that operate on the iPhone and integrate with its services. Author Richard Wagner shares his experience as he guides readers through the process of building new applications from scratch and migrating existing Web 2.0 applications to this new mobile platform.
Utilizing practical examples, the book shows how to build a wide range of solutions–from a basic XHTML/CSS client to an advanced Ajax-enabled database application. As it does so, it helps readers design a user interface that is optimized for the iPhone touch-screen display. Additionally, the book helps readers integrate their applications with iPhone services, including phone dialog, its motion sensor, and Google Maps.
With this book, readers will discover how to:
* Build an XHTML and CSS UI framework from the ground up
* Emulate the look and feel of built-in applications
* Integrate public Web 2.0 APIs into applications
* Capture finger touch interactions
* Use Ajax to load external pages
* Create mashups for the iPhone
* Store local and remote data
* Optimize applications for the EDGE network
* Test, debug, and deploy iPhone applications
* And more.
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